Superior Bassworks Ultimate Upright Double Bass Endpin Rubber Tip for 10.0-12.5mm Diameter Large Endpins HIGH QUALITY INDUSTRIAL GRADE RUBBER "TIRE TREAD" BOTTOM GRIP TO PREVENT SLIDING INTERNAL METAL LAYER TO PREVENT PUNCTURE HOLDS TIGHTLY TO THE ENDPIN FITS 10MM-12.5MM ENDPINS - 1 INCH (25MM) INSIDE DEPTH